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Daniel Veillard writes:
> Hum, assume you don't have a fixed base on a, then you force generating
> a base depending on the document base,, which mean suddenly canonicalization
> of a document depends on how you retrieved it (e.g. a file access would
> end up with file:///localpath/test/test while from a web access you would
> get http://example.org/test/test , I don't think it's acceptable either.
>
>> Can't we come up with a way to get this effect?
>
> I definitely prefer a solution leading to false negative i.e. we fail to
> canonicalize in the same way, than a situation leading to false positive
> where the canonicalization result in a broken result.
> We already discussed in the past especially with Richard generating
> relative xml:base when possible, maybe we need to formalize this and
> put it as the algorithm to compute the canonicalized result.
So we have been discussing this on the call today, and the straw man
reads, roughly:
Use the name *EII* for an element information item to be
canonicalized, and *EIIC* for the element information item
corresponding to *EII* in the result of parsing the canonical
serialization of the node-set containing *EII*.
Synthesize an xml:base attribute for *EII* iff the *EIIC*'s [base
URI] would otherwise be different from *EII*'s [base URI]."
If the only absolute URI involved in the calculation of [base URI]
for an element is the document [base URI], then when you need to
output an xml:base based on an element's [base URI], relativize wrt
the document base.
So for example, given
<a>
<b xml:base="test">
<c xml:base="test"/>
</b>
</a>
with the 'b' being clipped out, we get
<a>
<c xml:base="test/test"/>
</a>
This leaves only the case where the document [base URI] is not known.
Will this work to avoid a negative impact of '../../...'?:
In the absence of a document [base URI], assume one of the form
"file:/a/a/a/"
with more 'a' steps then the total number of '..' steps in all the
xml:base in the document
ht
- --
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
Half-time member of W3C Team
2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk
URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
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